Pyongyang’s last blast rendered part of the site unusable and a new test would cause an ‘environmental catastrophe’

BEIJING—A large part of North Korea’s underground nuclear test facility, which leader Kim Jong Un pledged to close, is unusable anyway due to the collapse of a cavity inside the mountain after the last blast there, Chinese scientists say.

Seismologists involved in a soon-to-be-published study also warned that another blast in the same spot and with similar yield could cause “environmental catastrophe.”

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